{"product_id":"o2-oxygen-sensor-upstream-downstream-for-pontiac-grand-prix-1997-2003-3-8l","title":"O2 Oxygen Sensor Upstream Downstream for Pontiac Grand Prix (1997-2003) 3.8L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit O2 Sensor Kit for 1997-2003 Pontiac Grand Prix (W-Body)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This matched upstream and downstream oxygen sensor kit monitors pre- and post-cat exhaust oxygen on the 1997-2003 \u003cstrong\u003eW-Body\u003c\/strong\u003e Pontiac Grand Prix \u003cstrong\u003e3.8L V6\u003c\/strong\u003e to regulate closed-loop fueling.\u003c\/p\u003e\u003ch3\u003eThe Stock Pontiac Grand Prix Sensor Failure\u003c\/h3\u003e\u003cp\u003eOn the \u003cstrong\u003eW-Body\u003c\/strong\u003e Grand Prix with the \u003cstrong\u003eL36 \/ L67 3.8L V6\u003c\/strong\u003e, factory zirconia sensors endure intense thermal cycling, soot, and contamination from aging intake gaskets. Over time, the ceramic sensing element cracks from thermal shock while the internal heater circuit corrodes and opens. This causes sluggish voltage switching upstream and inaccurate catalyst monitoring downstream, forcing open-loop fueling and triggering \u003cstrong\u003eP0134\u003c\/strong\u003e, \u003cstrong\u003eP0135\u003c\/strong\u003e, or \u003cstrong\u003eP0141\u003c\/strong\u003e codes.\u003c\/p\u003e\u003ch4\u003eCommon Symptoms of a Failing OEM O2 Sensor\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck Engine Light \/ DTCs:\u003c\/strong\u003e Triggers \u003cstrong\u003eP0134\u003c\/strong\u003e (no activity) or \u003cstrong\u003eP0135\u003c\/strong\u003e\/\u003cstrong\u003eP0141\u003c\/strong\u003e heater circuit codes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoor Fuel Economy:\u003c\/strong\u003e Sluggish switching locks open-loop enrichment, fouling spark plugs and catalysts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRough Idle \u0026amp; Failed Emissions:\u003c\/strong\u003e Erratic fueling causes hesitation and tailpipe inspection failure.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Heated Zirconia Solution\u003c\/h3\u003e\u003cp\u003eReplacing both sensors as a matched set restores rapid closed-loop voltage switching between \u003cstrong\u003e0.1V and 0.9V\u003c\/strong\u003e across the exhaust stream. Each direct-fit sensor features a porous stainless shield, laser-welded housing, and fast-acting internal ceramic heater engineered to resist thermal shock and exhaust moisture. Pre-terminated \u003cstrong\u003e4-wire\u003c\/strong\u003e OEM connectors eliminate splicing, ensuring clean \u003cstrong\u003ePCM\u003c\/strong\u003e signal transmission and bolt-on installation into stock \u003cstrong\u003eL36 \/ L67\u003c\/strong\u003e exhaust bungs.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 Upstream Oxygen Sensor\u003c\/li\u003e\n\u003cli\u003e1 Downstream Oxygen Sensor\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e1997-2003 Pontiac Grand Prix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e3.8L V6 (L36 \/ L67) \/ W-Body\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEmissions \u0026amp; Substrate\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eEPA Federal Compliant \/ Heated 4-Wire Zirconia Element\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eInstallation Type\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eDirect Bolt-On OEM Replacement (No Cutting or Wiring)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e1997-2003 Pontiac Grand Prix 3.8L (Confirm engine before ordering)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the W-Body Grand Prix?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Direct fit for the 1997-2003 Pontiac Grand Prix equipped with the \u003cstrong\u003e3.8L V6 (L36 \/ L67)\u003c\/strong\u003e engine. \u003cstrong\u003eExcludes 3.1L V6 models; confirm your engine before ordering.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear P0135 or P0141 codes?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes, when caused by sensor wear or heater failure.\u003c\/strong\u003e Restores proper voltage switching to clear \u003cstrong\u003eP0134\u003c\/strong\u003e, \u003cstrong\u003eP0135\u003c\/strong\u003e, and \u003cstrong\u003eP0141\u003c\/strong\u003e once reset, provided wiring and exhaust are intact.\u003c\/p\u003e\u003ch4\u003eIs wiring modification required for installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e Both sensors include OEM-style connectors for direct installation; lightly coat threads only with anti-seize before torqueing into clean bungs.\u003c\/p\u003e\u003ch3\u003eThe Pontiac Precision Standard\u003c\/h3\u003e\u003cp\u003eEngineered to restore closed-loop fueling accuracy on your \u003cstrong\u003eW-Body\u003c\/strong\u003e Grand Prix, this matched O2 sensor kit delivers consistent throttle response and emissions compliance. Keep your \u003cstrong\u003e3.8L V6\u003c\/strong\u003e running CEL-free with reliable stoichiometry.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68116128268536,"sku":"DS-EMKOCHKD3","price":37.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-pontiac-grand-prix-1997-2003-3-8l-1.jpg?v=1794710814","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-pontiac-grand-prix-1997-2003-3-8l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}